[PSUBS-MAILIST] inertia calculation for stiffeners

["gordon alexander" <gordon@curio.com>]

I have been trying to use the formulas in section 6 (Metallic Pressure
Boundary Components) of the ABS "Rules for Building and Classing Underwater
Vehicles, Systems and Hyperbaric Facilities". I have a question for any of
you fellows out there who have a grasp of the inertia calculations for
stiffeners in pressure boundaries. I note that the inertia formulas for both
heavy and non-heavy stiffeners (19.15.1 - pg 67 and 19.15.2 - pg 68) contain
"P". This is the external applied pressure, no? What is it doing in a
formula used to determine the failure pressures of pressure barriers? It
seems a bit circular to me at this point. My head hurts:-(
Can anyone tell me what is going on here?

Gordon Alexander
Shakopee, MN





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